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gerrit.opencord.org / voltha-go / ac63710ec22a279b455379ba0a9456c0a5f2cdde / . / vendor / github.com / DataDog / zstd / zstd_legacy.h
blob: 5893cb9657e62be90e8dcbda5176197dc253159f [file] [log] [blame]
khenaidooac637102019-01-14 15:44:34 -0500[diff] [blame^]1/*
2 * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under both the BSD-style license (found in the
6 * LICENSE file in the root directory of this source tree) and the GPLv2 (found
7 * in the COPYING file in the root directory of this source tree).
8 * You may select, at your option, one of the above-listed licenses.
9 */
10
11#ifndef ZSTD_LEGACY_H
12#define ZSTD_LEGACY_H
13
14#if defined (__cplusplus)
15extern "C" {
16#endif
17
18/* *************************************
19* Includes
20***************************************/
21#include "mem.h" /* MEM_STATIC */
22#include "error_private.h" /* ERROR */
23#include "zstd.h" /* ZSTD_inBuffer, ZSTD_outBuffer */
24
25#if !defined (ZSTD_LEGACY_SUPPORT) || (ZSTD_LEGACY_SUPPORT == 0)
26# undef ZSTD_LEGACY_SUPPORT
27# define ZSTD_LEGACY_SUPPORT 8
28#endif
29
30#if (ZSTD_LEGACY_SUPPORT <= 1)
31# include "zstd_v01.h"
32#endif
33#if (ZSTD_LEGACY_SUPPORT <= 2)
34# include "zstd_v02.h"
35#endif
36#if (ZSTD_LEGACY_SUPPORT <= 3)
37# include "zstd_v03.h"
38#endif
39#if (ZSTD_LEGACY_SUPPORT <= 4)
40# include "zstd_v04.h"
41#endif
42#if (ZSTD_LEGACY_SUPPORT <= 5)
43# include "zstd_v05.h"
44#endif
45#if (ZSTD_LEGACY_SUPPORT <= 6)
46# include "zstd_v06.h"
47#endif
48#if (ZSTD_LEGACY_SUPPORT <= 7)
49# include "zstd_v07.h"
50#endif
51
52/** ZSTD_isLegacy() :
53 @return : > 0 if supported by legacy decoder. 0 otherwise.
54 return value is the version.
55*/
56MEM_STATIC unsigned ZSTD_isLegacy(const void* src, size_t srcSize)
57{
58 U32 magicNumberLE;
59 if (srcSize<4) return 0;
60 magicNumberLE = MEM_readLE32(src);
61 switch(magicNumberLE)
62 {
63#if (ZSTD_LEGACY_SUPPORT <= 1)
64 case ZSTDv01_magicNumberLE:return 1;
65#endif
66#if (ZSTD_LEGACY_SUPPORT <= 2)
67 case ZSTDv02_magicNumber : return 2;
68#endif
69#if (ZSTD_LEGACY_SUPPORT <= 3)
70 case ZSTDv03_magicNumber : return 3;
71#endif
72#if (ZSTD_LEGACY_SUPPORT <= 4)
73 case ZSTDv04_magicNumber : return 4;
74#endif
75#if (ZSTD_LEGACY_SUPPORT <= 5)
76 case ZSTDv05_MAGICNUMBER : return 5;
77#endif
78#if (ZSTD_LEGACY_SUPPORT <= 6)
79 case ZSTDv06_MAGICNUMBER : return 6;
80#endif
81#if (ZSTD_LEGACY_SUPPORT <= 7)
82 case ZSTDv07_MAGICNUMBER : return 7;
83#endif
84 default : return 0;
85 }
86}
87
88
89MEM_STATIC unsigned long long ZSTD_getDecompressedSize_legacy(const void* src, size_t srcSize)
90{
91 U32 const version = ZSTD_isLegacy(src, srcSize);
92 if (version < 5) return 0; /* no decompressed size in frame header, or not a legacy format */
93#if (ZSTD_LEGACY_SUPPORT <= 5)
94 if (version==5) {
95 ZSTDv05_parameters fParams;
96 size_t const frResult = ZSTDv05_getFrameParams(&fParams, src, srcSize);
97 if (frResult != 0) return 0;
98 return fParams.srcSize;
99 }
100#endif
101#if (ZSTD_LEGACY_SUPPORT <= 6)
102 if (version==6) {
103 ZSTDv06_frameParams fParams;
104 size_t const frResult = ZSTDv06_getFrameParams(&fParams, src, srcSize);
105 if (frResult != 0) return 0;
106 return fParams.frameContentSize;
107 }
108#endif
109#if (ZSTD_LEGACY_SUPPORT <= 7)
110 if (version==7) {
111 ZSTDv07_frameParams fParams;
112 size_t const frResult = ZSTDv07_getFrameParams(&fParams, src, srcSize);
113 if (frResult != 0) return 0;
114 return fParams.frameContentSize;
115 }
116#endif
117 return 0; /* should not be possible */
118}
119
120
121MEM_STATIC size_t ZSTD_decompressLegacy(
122 void* dst, size_t dstCapacity,
123 const void* src, size_t compressedSize,
124 const void* dict,size_t dictSize)
125{
126 U32 const version = ZSTD_isLegacy(src, compressedSize);
127 (void)dst; (void)dstCapacity; (void)dict; (void)dictSize; /* unused when ZSTD_LEGACY_SUPPORT >= 8 */
128 switch(version)
129 {
130#if (ZSTD_LEGACY_SUPPORT <= 1)
131 case 1 :
132 return ZSTDv01_decompress(dst, dstCapacity, src, compressedSize);
133#endif
134#if (ZSTD_LEGACY_SUPPORT <= 2)
135 case 2 :
136 return ZSTDv02_decompress(dst, dstCapacity, src, compressedSize);
137#endif
138#if (ZSTD_LEGACY_SUPPORT <= 3)
139 case 3 :
140 return ZSTDv03_decompress(dst, dstCapacity, src, compressedSize);
141#endif
142#if (ZSTD_LEGACY_SUPPORT <= 4)
143 case 4 :
144 return ZSTDv04_decompress(dst, dstCapacity, src, compressedSize);
145#endif
146#if (ZSTD_LEGACY_SUPPORT <= 5)
147 case 5 :
148 { size_t result;
149 ZSTDv05_DCtx* const zd = ZSTDv05_createDCtx();
150 if (zd==NULL) return ERROR(memory_allocation);
151 result = ZSTDv05_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
152 ZSTDv05_freeDCtx(zd);
153 return result;
154 }
155#endif
156#if (ZSTD_LEGACY_SUPPORT <= 6)
157 case 6 :
158 { size_t result;
159 ZSTDv06_DCtx* const zd = ZSTDv06_createDCtx();
160 if (zd==NULL) return ERROR(memory_allocation);
161 result = ZSTDv06_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
162 ZSTDv06_freeDCtx(zd);
163 return result;
164 }
165#endif
166#if (ZSTD_LEGACY_SUPPORT <= 7)
167 case 7 :
168 { size_t result;
169 ZSTDv07_DCtx* const zd = ZSTDv07_createDCtx();
170 if (zd==NULL) return ERROR(memory_allocation);
171 result = ZSTDv07_decompress_usingDict(zd, dst, dstCapacity, src, compressedSize, dict, dictSize);
172 ZSTDv07_freeDCtx(zd);
173 return result;
174 }
175#endif
176 default :
177 return ERROR(prefix_unknown);
178 }
179}
180
181MEM_STATIC size_t ZSTD_findFrameCompressedSizeLegacy(const void *src,
182 size_t compressedSize)
183{
184 U32 const version = ZSTD_isLegacy(src, compressedSize);
185 switch(version)
186 {
187#if (ZSTD_LEGACY_SUPPORT <= 1)
188 case 1 :
189 return ZSTDv01_findFrameCompressedSize(src, compressedSize);
190#endif
191#if (ZSTD_LEGACY_SUPPORT <= 2)
192 case 2 :
193 return ZSTDv02_findFrameCompressedSize(src, compressedSize);
194#endif
195#if (ZSTD_LEGACY_SUPPORT <= 3)
196 case 3 :
197 return ZSTDv03_findFrameCompressedSize(src, compressedSize);
198#endif
199#if (ZSTD_LEGACY_SUPPORT <= 4)
200 case 4 :
201 return ZSTDv04_findFrameCompressedSize(src, compressedSize);
202#endif
203#if (ZSTD_LEGACY_SUPPORT <= 5)
204 case 5 :
205 return ZSTDv05_findFrameCompressedSize(src, compressedSize);
206#endif
207#if (ZSTD_LEGACY_SUPPORT <= 6)
208 case 6 :
209 return ZSTDv06_findFrameCompressedSize(src, compressedSize);
210#endif
211#if (ZSTD_LEGACY_SUPPORT <= 7)
212 case 7 :
213 return ZSTDv07_findFrameCompressedSize(src, compressedSize);
214#endif
215 default :
216 return ERROR(prefix_unknown);
217 }
218}
219
220MEM_STATIC size_t ZSTD_freeLegacyStreamContext(void* legacyContext, U32 version)
221{
222 switch(version)
223 {
224 default :
225 case 1 :
226 case 2 :
227 case 3 :
228 (void)legacyContext;
229 return ERROR(version_unsupported);
230#if (ZSTD_LEGACY_SUPPORT <= 4)
231 case 4 : return ZBUFFv04_freeDCtx((ZBUFFv04_DCtx*)legacyContext);
232#endif
233#if (ZSTD_LEGACY_SUPPORT <= 5)
234 case 5 : return ZBUFFv05_freeDCtx((ZBUFFv05_DCtx*)legacyContext);
235#endif
236#if (ZSTD_LEGACY_SUPPORT <= 6)
237 case 6 : return ZBUFFv06_freeDCtx((ZBUFFv06_DCtx*)legacyContext);
238#endif
239#if (ZSTD_LEGACY_SUPPORT <= 7)
240 case 7 : return ZBUFFv07_freeDCtx((ZBUFFv07_DCtx*)legacyContext);
241#endif
242 }
243}
244
245
246MEM_STATIC size_t ZSTD_initLegacyStream(void** legacyContext, U32 prevVersion, U32 newVersion,
247 const void* dict, size_t dictSize)
248{
249 DEBUGLOG(5, "ZSTD_initLegacyStream for v0.%u", newVersion);
250 if (prevVersion != newVersion) ZSTD_freeLegacyStreamContext(*legacyContext, prevVersion);
251 switch(newVersion)
252 {
253 default :
254 case 1 :
255 case 2 :
256 case 3 :
257 (void)dict; (void)dictSize;
258 return 0;
259#if (ZSTD_LEGACY_SUPPORT <= 4)
260 case 4 :
261 {
262 ZBUFFv04_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv04_createDCtx() : (ZBUFFv04_DCtx*)*legacyContext;
263 if (dctx==NULL) return ERROR(memory_allocation);
264 ZBUFFv04_decompressInit(dctx);
265 ZBUFFv04_decompressWithDictionary(dctx, dict, dictSize);
266 *legacyContext = dctx;
267 return 0;
268 }
269#endif
270#if (ZSTD_LEGACY_SUPPORT <= 5)
271 case 5 :
272 {
273 ZBUFFv05_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv05_createDCtx() : (ZBUFFv05_DCtx*)*legacyContext;
274 if (dctx==NULL) return ERROR(memory_allocation);
275 ZBUFFv05_decompressInitDictionary(dctx, dict, dictSize);
276 *legacyContext = dctx;
277 return 0;
278 }
279#endif
280#if (ZSTD_LEGACY_SUPPORT <= 6)
281 case 6 :
282 {
283 ZBUFFv06_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv06_createDCtx() : (ZBUFFv06_DCtx*)*legacyContext;
284 if (dctx==NULL) return ERROR(memory_allocation);
285 ZBUFFv06_decompressInitDictionary(dctx, dict, dictSize);
286 *legacyContext = dctx;
287 return 0;
288 }
289#endif
290#if (ZSTD_LEGACY_SUPPORT <= 7)
291 case 7 :
292 {
293 ZBUFFv07_DCtx* dctx = (prevVersion != newVersion) ? ZBUFFv07_createDCtx() : (ZBUFFv07_DCtx*)*legacyContext;
294 if (dctx==NULL) return ERROR(memory_allocation);
295 ZBUFFv07_decompressInitDictionary(dctx, dict, dictSize);
296 *legacyContext = dctx;
297 return 0;
298 }
299#endif
300 }
301}
302
303
304
305MEM_STATIC size_t ZSTD_decompressLegacyStream(void* legacyContext, U32 version,
306 ZSTD_outBuffer* output, ZSTD_inBuffer* input)
307{
308 DEBUGLOG(5, "ZSTD_decompressLegacyStream for v0.%u", version);
309 switch(version)
310 {
311 default :
312 case 1 :
313 case 2 :
314 case 3 :
315 (void)legacyContext; (void)output; (void)input;
316 return ERROR(version_unsupported);
317#if (ZSTD_LEGACY_SUPPORT <= 4)
318 case 4 :
319 {
320 ZBUFFv04_DCtx* dctx = (ZBUFFv04_DCtx*) legacyContext;
321 const void* src = (const char*)input->src + input->pos;
322 size_t readSize = input->size - input->pos;
323 void* dst = (char*)output->dst + output->pos;
324 size_t decodedSize = output->size - output->pos;
325 size_t const hintSize = ZBUFFv04_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
326 output->pos += decodedSize;
327 input->pos += readSize;
328 return hintSize;
329 }
330#endif
331#if (ZSTD_LEGACY_SUPPORT <= 5)
332 case 5 :
333 {
334 ZBUFFv05_DCtx* dctx = (ZBUFFv05_DCtx*) legacyContext;
335 const void* src = (const char*)input->src + input->pos;
336 size_t readSize = input->size - input->pos;
337 void* dst = (char*)output->dst + output->pos;
338 size_t decodedSize = output->size - output->pos;
339 size_t const hintSize = ZBUFFv05_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
340 output->pos += decodedSize;
341 input->pos += readSize;
342 return hintSize;
343 }
344#endif
345#if (ZSTD_LEGACY_SUPPORT <= 6)
346 case 6 :
347 {
348 ZBUFFv06_DCtx* dctx = (ZBUFFv06_DCtx*) legacyContext;
349 const void* src = (const char*)input->src + input->pos;
350 size_t readSize = input->size - input->pos;
351 void* dst = (char*)output->dst + output->pos;
352 size_t decodedSize = output->size - output->pos;
353 size_t const hintSize = ZBUFFv06_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
354 output->pos += decodedSize;
355 input->pos += readSize;
356 return hintSize;
357 }
358#endif
359#if (ZSTD_LEGACY_SUPPORT <= 7)
360 case 7 :
361 {
362 ZBUFFv07_DCtx* dctx = (ZBUFFv07_DCtx*) legacyContext;
363 const void* src = (const char*)input->src + input->pos;
364 size_t readSize = input->size - input->pos;
365 void* dst = (char*)output->dst + output->pos;
366 size_t decodedSize = output->size - output->pos;
367 size_t const hintSize = ZBUFFv07_decompressContinue(dctx, dst, &decodedSize, src, &readSize);
368 output->pos += decodedSize;
369 input->pos += readSize;
370 return hintSize;
371 }
372#endif
373 }
374}
375
376
377#if defined (__cplusplus)
378}
379#endif
380
381#endif /* ZSTD_LEGACY_H */